Larryboy from VeggieTales
LarryBoy is the superhero alter ego of Larry the Cucumber (voiced by Mike Nawrocki). He uses every power in his control to be the best superhero he can be. Which, generally speaking, are his plunger ears. Those and his LarryMobile which is as close to all-terrain as it can get!
Cosplaying as LarryBoy means taking a few liberties with the look. Larry is, after all, a cucumber. He has no arms or legs. You, as a human, are going to have to improvise.
To that end, use a white long sleeve lace-up shirt as his top and paint on a yellow vest and ties using fabric paint, reminiscent of Silver Age hero costumes. A pair of purple shorts worn over yellow running pants will give you the purple bottoms while still sticking to that Silver Age style. A back belt serves as a utility belt while yellow foam and silver paint can recreate his belt buckle. You can either hot glue this to your belt buckle or glue a magnet to the back of the foam, depending on how permanent you want the modification to be.
Larry’s hat is where it gets a little tricky. Plungers can be kind of heavy. But if you can find two lightweight ones, you can cut the posts down and glue them to either side of a purple mask. Purple foam and more hot glue gives you the crest of his mask while green face paint gives you the signature cucumber look. Then all you need is a pair of black hero boots to finish off your costume.